#pragma once

#include<iostream>
#include<string>
#include<assert.h>

using namespace std;

namespace ST
{
	class string
	{
	public:
		static const size_t npos;
		typedef char* iterator;
		typedef const char* const_iterator;

		iterator begin();
		iterator end();

		const_iterator begin() const;
		const_iterator end() const;

		//string();
		string(const char* str = "");
		const char* c_str() const;
		~string();
		string(const string& s);
		//string& operator=(const string& s);
		string& operator=(string s);
		void swap(string& s);

		size_t size() const;
		char& operator[](size_t i);
		const char& operator[](size_t i)const;

		void reserve(size_t n);

		void push_back(char ch);
		void append(const char* str);
		string& operator+=(char ch);
		string& operator+=(const char* ch);

		void pop_back();
		string& insert(size_t pos, char ch);
		string& insert(size_t pos, const char* str);
		string& erase(size_t pos, size_t len = npos);

		size_t find(char ch, size_t pos = 0)const;
		size_t find(const char* str, size_t pos = 0)const;
		
		string substr(size_t pos, size_t len = npos)const;
		void clear();

		bool operator<(const string& s) const;
		bool operator<=(const string& s) const;
		bool operator>(const string& s) const;
		bool operator>=(const string& s) const;
		bool operator==(const string& s) const;
		bool operator!=(const string& s) const;
	private:
		char* _str = nullptr;
		size_t _size = 0;
		size_t _capacity = 0;
	
		
	};
}
